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Help with Flywheel


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  #1  
Old 04-29-2012, 08:27:54 PM
dms0115 dms0115 is offline
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Default Help with Flywheel

I have an 8' flywheel that weighs 2500 lbs. It was used on a line shaft at a local factory. I have 2 questions.
1. Does anyone have an idea of a safe top operating speed?

2. Does anyone have a guess of the age by the picture?

The flywheel has 2 rings that were heated to squeeze it to the shaft and 4 notches apparently for trueing it up on the shaft prior to installing the rings. However I'm going to bore it to make it run true, put it on a key way, press it on a shaft and put 2 rings in it. Thanks for any information.
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  #2  
Old 04-29-2012, 11:43:03 PM
LCJudge LCJudge is offline
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Default Re: Help with Flywheel

I have no idea as to the age of the flywheel but just guessing, it looks early, maybe late 1800's (1880 ish). Very neat looking flywheel and at 8', that thing sure would look impressive turning on a shaft.
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Old 04-29-2012, 11:46:50 PM
DirtbikePilot DirtbikePilot is offline
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Default Re: Help with Flywheel

If it's cast iron, the usual top speed I've seen before is 60 mph rim speed. I can't say it's safe to run that flywheel that fast, just that this is the usual safety limit for a cast iron flywheel. If there are any structural defects in the casting or invisible cracks, bad things can happen when you have 2500 pounds of cast iron going 60 mph.
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Old 04-30-2012, 01:53:05 AM
Matt Montague Matt Montague is offline
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Default Re: Help with Flywheel

Hey Chris how are you doing?
Your 60 mph seemed a little high so I ran the numbers. I came up with 210 RPM for a 96" wheel.
I recommend that the machinery handbook be referred to and that the calulations for recommended rpm be followed.
I think that long before I mounted and turned a flywheel of this size I would give very serious thought to having it Magnetic Partical checked for cracks. This is very cheap to do.
2500 pounds is a very large wheel, it is going to need some HP to get it up to speed. And it will not stop very fast.
Take care.
Matt
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Old 04-30-2012, 06:32:57 AM
Darryl Darryl is offline
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Default Re: Help with Flywheel

probably early mill engine flywheel trued up with wedges onto crankshaft, i'd say it only went about a hundred or so RPM's and remember that it wont be a close grained cast iron like a more modern casting.
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Old 04-30-2012, 10:04:08 PM
DirtbikePilot DirtbikePilot is offline
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Default Re: Help with Flywheel

Hi Matt. I'm doing ok except work has gone down hill.

60 mph rim speed is 211 rpm, so it seems we're both right.
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Old 05-01-2012, 01:28:17 AM
Matt Montague Matt Montague is offline
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Default Re: Help with Flywheel

Hey Chris,
I thought that you were doctoring???
Yep 210/211 = 60 MPH, I am just saying that seems a little fast to me and that a little time in the handbook may not be a bad thing.
I hope things get better for you.
Matt
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